Improvement in steam-hammers



UNITED STATES PATENT OFFICE.

CHARLES W. VVILLARD AND JOHN P. VILLARD, OF CHICAGO,V ILL.

IMPROVEMENT IN STEAM-HAMMEPLS.

Specitication forming part of Letters Patent No. 44,573, dated October4, 1864.

To all whom t may concern.-

Be it known that we, CHARLES W. VIL- Lann and Jox-1N P. WILLAED, ofChicago, in the county ot' Cook and State of Illinois, have invented anew and Improved Steam Trip- Hammer; and we do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing had to the accompanying drawings, forming part of thisspeciiication, in which- Figure l represents a side elevation of thisinvention. Fig. 2 is a sectional plan or top view of the same.

Similar letters of reference indicate like parts.

The object of this invention is to simplify the mechanism whereby themotion of the helve or of the hammer is transmitted to the steam-valveand the steam changed automatically at the desired moment.

The invention consists in the employment or use ot' two rollers,adjustable on the yoke in the direction in which the cross-head moves,in combination with a double-inclined cam secured to or moving with thecross-head of the steam-piston, which is connected to the lielve of thehammer in such a manner that by the action of the double-inclined cam onthe rollers the steam valve is changed, and by adjusting the rollers upor down on the yoke the stroke of the hammer can be regulated with thegreatest accuracy and with' little trouble or loss of time.

A represents a hammer, which is connected to the helve B, thatoscillates on the trunnions C in the ordinary manner. D is thesteamcylinder, which is situated under the helve, between the-trunnionsC and the hammer A,

at asuitable distance from the other to iin' part to the hammer therequired maximum stroke. rlhe piston-rod E is secured in the is fastenedto one end of the cross head, serves to produce the change of thesteam-valve. This cam forms two inclined planes, which strike againstrollers b b', attached to the yoke c, and this yoke connects by suitablerods andlinks with the stem d of the valve H.

The yoke c moves between suitable ways, which are secured to one of theuprights Gr, and it is composed ot two vertical and two horizontal bars,as clearly shown in the drawings. The rollers b b are adjustable bymeans of spring-catches c on the upright bars of the yoke, or, insteadot' these spring-catches, ordinary set-screws or any other suitablemechanism may be employed.

The valve H shown in the drawings belongs to the class of revolvingvalves; but we do not wish to confine ourselves to any particular kindof valves, since our improvement is applicable to valves ot' anydescription, though it is desirable to use a balance-valve, which willnove easy and independent of the pressure of the steam to which it issubjected.

When the rollers b b are both at their lowest position, the cam changesthe valve after the hammer has ascended a little distance, and thestroke is consequently very short; but if it is desired to increase thestroke of the hammer, the roller b is raised, or the two rollers areplaced at ditterent levels, and the greater the vertical distancebetween said rollers the greater the stroke.

The cam a, instead of being attached to the cross-head, might beconnected by suitable means with the helve of the hammer, and the resultwould be the same.

XVe claim as new and desire to secure by Letters Patent- The rollers bb, adjustable 011 the yoke c, and operating in combination with the cama, steam-cylinder D, and hammer A, in the man-` ner and for the purposesubstantially as herein shown and described.

CHAS. W. VILLARD. JOHN P. WILLARD. Vitnesses:

GEORGE R. H. HUenEs, J oHN l). PYNonoN.

